Mr. Shalygin, Evgeny
Hi Mike. Nice to see you are active here and helps to people.
The other factor what could limit % of slurry processed is Benzo(a)pyrene-content in green coke. Depending on local country regulations the B(a)ps content may be limited e.g. by max 100 ppm. In such case test runs will set max slurry % in feed.
In particular FCC slurries are known for positive effect by fouling mitigation and Na (metals)-dilution in Coker feed (known FCC cat is captured prior to coker).